不同载荷对Sialon陶瓷摩擦磨损性能的影响

Effect of different loads on the friction andwear properties of Sialon ceramic

通过气压烧结于1750℃制备致密Sialon陶瓷,利用球-盘直线往复式滑动摩擦磨损实验,研究干摩擦条件下不同载荷对Sialon陶瓷的摩擦磨损性能的影响.采用XRD分析材料的物相组成,SEM观察分析材料表面形貌及磨损表面形貌;同时,采用EDS能谱仪分析磨损表面和初始表面的元素分布变化.研究结果表明:Sialon陶瓷的相对密度可达96.8%,硬度为14.88 GPa,断裂韧性为4.66 MPa·m^(1/2).随着载荷增加,摩擦系数先下降后增加,而磨损体积和体积磨损率不断增加.干摩擦条件下,Sialon材料的磨损表面有摩擦氧化层生成,磨损表面和初始表面分界处有磨屑产生,其磨损机制以氧化磨损和磨粒磨损为主.

In this work,a dense Sialon ceramic was fabricated at 1750℃by gas-pressure sintering.The friction and wear properties of the Sialon ceramic without lubricant under different loads were investigated by the ball-on-disc sliding friction and wear test method.Phase composition was carried out by XRD,the morphologies of sample and worn surface were analyzed by SEM,the distribution of elements of the worn surface and original surface was investigated by EDS spectrometer.The results show that the sintered Sialon ceramic had a relative density of 96.8%,hardness of 14.88 GPa,and fracture toughness of 4.66 MPa·m^(1/2).When the load increased from 10 N to 30 N,the friction coefficient declined from 0.758 to 0.690,and then increased to 0.712,while the worn volume loss and volume wear rate increased continuously.During the dry friction processing,tribochemical layers were formed on the worn surface and wear debris existed between the worn surface and original surface.In this work,the predominate wear mechanisms of Sialon ceramic were oxidation wear and abrasive wear.